Printing solution



Patented Dec. 20, 1938 UNITED STATES PATENT OFFICE PRINTING SOLUTION aware No Drawing. Application December '7, 1935, Serial No. 53,432

2 Claims.

My invention relates to a composition of matter which may be used for imitating the watermarking of paper or for printing on paper or other cellulose compounds. At present watermarking is efiected during the process of making the paper while the paper web is still wet. The watermarks are produced by physical means.

My invention permits the application of marks of somewhat similar character or at least of an 10 appearance similar to Watermarking by incorporating in the paper certain chemicals after the paper has been manufactured. These chemicals in solution can be applied to the paper or other sheet or body of cellulosic material by means of a printing press, using lead, rubber, electro, zinc or other type, or by means of a stencil, brush, pen or other suitable instrument.

The compound consists of an aromatic hydrocarbon of the benzene series, such as benzol or toluol, a vegetable oil, such as castor oil or linseed oil, gum spirits of turpentine, and a solvent or solvents, such as an alcohol of the monohydric group such as methyl or ethyl alcohol,

methanol, an ester of the ethyl or butyl acetate type and acetone.

The effect of application of the solution to paper, for example, is to make the paper partly transparent or translucent. The solvents act to soften the paper and carry the vegetable oil into the paper where it is fixed by the turpentine, the solvents evaporating.

The following are examples of solutions suitable for the purpose:

35 Example No. 1: Parts Benzol (by weight) 3. Alcohol 4. 5 Castor oil 2 Gum spirits of turpentine 3 40 Example No. 2:

Toluol 3 Alcohol 3 Ethyl acetate 2 Linseed oil 2 45 Gum spirits of turpentine 3 Example No. 3:

Aromatic hydrocarbon 3 Alcohol 3 Acetone 2 50 Vegetable oil 2 Gum spirits of turpentine 3 A marking like a watermark is obtained when a small amount of the liquid is transferred to paper. When a larger amount is transferred, a marking is obtained which can be read more easily and may replace printing ink. The mixture can be used as a transparent liquid or can be colored either by soluble dyes or finely ground 5 pigments. The material will penetrate the paper partly or completely, according to how much of the solution is transferred. If the material is used for check protection, the writing so protected can not be erased without visibly harming the paper. The material canbe used in many places where printing ink is now used, for example, in multiple color printing, half-tones, printing of wall paper, wrapping paper, letterheads, envelopes, checks and stamps. The solution. dries very quickly so that olfsetting is prevented. If desired, there may be applied to the markings made by the solution metal powders such as aluminum and bronze. If used as a substitute for a watermark, the marking produced by the material will not change in time even if exposed to extreme heat, light, or both.

The proportions of the formula herein given are preferential and are not to be considered as limitations on the invention. In other respects I wish it understood that I do not intend that the invention be limited to the exact details described, as obvious modifications will occur to those skilled in the art.

Included in esters of the butyl or ethyl acetate type are amyl acetate and methyl acetate. Under the term body of cellulosic material is intended to be included papers of all kinds, nitro cellulose, cellulose acetate, viscose, or any esters of cellulose in the form of sheets or other solid bodies.

I claim:

1. A marking composition for paper consisting of from about three to about 3.5 parts by weight of an aromatic hydrocarbon of the benzene series of the group consisting of benzol or toluol, about two parts of a vegetable oil, about three parts gum spirits of turpentine, and about three to 4.5 parts of a solvent of the group consisting of methyl or ethyl alcohol.

2. A marking composition for paper consisting of from about three to about 3.5 parts by weight of an aromatic hydrocarbon of the benzene series of the group consisting of benzol or toluol, about two parts of a vegetable oil, about three parts gum 50 spirits of turpentine, about three to 4.5 parts of a solvent of the group consisting of methyl or ethyl alcohol, and about two parts acetone.

FELIX LAUTER. 

